FC Derm(SA) Part I Practice Questions - Fellowship Of The College Of Dermatologists Of South Africa - Part I (Basic Cutaneous Sciences) Exam

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Which immunohistochemical staining pattern is classic for Merkel cell carcinoma and helps differentiate it from metastatic small cell lung carcinoma?

Perinuclear dot-like positivity for Cytokeratin 20 (CK20) Diffuse cytoplasmic positivity for Cytokeratin 7 (CK7) Nuclear positivity for Thyroid Transcription Factor-1 (TTF-1) Membranous positivity for CD45 (LCA)

Correct Answer:

Perinuclear dot-like positivity for Cytokeratin 20 (CK20)

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